Can you copy and share in this post the entire text from one of the splits as shown in your screenshot. This will help with providing the right regex to get the value you highlighted in your screenshot.
First, I would advise NOT to capture such dynamic fields such as SessionIDs. Even if you had to, then avoid storing those splits in the Performance Warehouse as these will cause the BT Explosion viz, too many splittings. Just uncheck the checkbox for BT store into PWH.
Secondly, Try out below regular expression to see it it works for your case:
let me know.
Also, I think you should post the Return/Argument value but instead you have posted snapshot of the details of the row in PurePath Dsahlet. Could you post correct methods snapshot/return value instead of the that. Reagrds, Rajesh.